<?php
namespace TYPO3\CMS\Core\Resource\TextExtraction;

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

use TYPO3\CMS\Core\Resource\FileInterface;
use TYPO3\CMS\Core\Utility\PathUtility;

/**
 * A simple text extractor to extract text from plain text files.
 *
 */
class PlainTextExtractor implements TextExtractorInterface {

	/**
	 * Checks if the given file can be read by this extractor
	 *
	 * @param FileInterface $file
	 * @return bool
	 */
	public function canExtractText(FileInterface $file) {
		$canExtract = FALSE;

		if ($file->getMimeType() === 'text/plain') {
			$canExtract = TRUE;
		}

		return $canExtract;
	}

	/**
	 * The actual text extraction.
	 *
	 * @param FileInterface $file
	 * @return string
	 */
	public function extractText(FileInterface $file) {
		$localTempFile = $file->getForLocalProcessing(FALSE);

		// extract text
		$content = file_get_contents($localTempFile);

		// In case of remote storage, the temporary copy of the
		// original file in typo3temp must be removed
		// Simply compare the filenames, because the filename is so unique that
		// it is nearly impossible to have a file with this name in a storage
		if (PathUtility::basename($localTempFile) !== $file->getName()) {
			unlink($localTempFile);
		}

		return $content;
	}

}
